Sam, I'm sorry to hear you're not getting an appropriate response. If the original roofer is that unresponsive it is unlikely that you would have better luck getting them to honor the 10 year warranty. I know the complexity you detailed in trying to make the repair, it's like what came first, the chicken or the egg? I recently helped a friend replace some rotten soffit and facia. The roof being only a few years old is in good condition so we liquid nailed the felt paper/shingles from the underside since there is no way to secure them with nails. We will say an extra prayer if a hurricane comes. Good luck with the repair, perhaps an experienced contractor will have a work around and know what to do in a situation like this. Most importantly is finding the source of the termites. If they have made their way to the facia, you may have a bigger problem than just the facia. Have you found the pathway for the termites and eliminated them?